Just my two cents here. Take your time and learn the game mode. It can be confusing at times but once it clicks you'll be racing around solo or with a group to fight, capture objectives, make call outs to your team with the appropriate information, etc.
The first thing in the wvw mastery track I would pick would be Warclaw. Just unlock the first point and start your progress to get one. It only takes a little while and makes a huge difference.
Oh and what others have said. Join a guild that plays this game mode. It makes a world of difference.